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Types of disturbances

…cid due to abomasal atony or displaced abomasa) in adult cattle; titration metabolic acidosis (lactic acidosis) and hyperchloremic bicarbonate loss metabolic acidosis (secretory diarrhea) in calves. Horses: Uncommon. Camelids: Uncommon. Related links Laboratory detection: Use of laboratory tests to diagnose acid-base disturbances, including more information on bicarbonate measurement and the anion gap calculation. Quick test interpretation: A g…

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Viscoelastic testing

…ing to determine the mechanism underlying massive intra-operative or traumatic hemorrhage. There are other uses for these tests, including assessment for platelet inhibitors and functional fibrinogen measurement (Brainard et al., 2014) and fibrinolysis (native or that induced by tissue plasminogen activator) (Spodsberg et al 2013, Fletcher et al 2014, Sigrist et al 2017). Because viscoelastic assays evaluate cellular and protein components o…

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Interference indices

…indicate how hemolysis (rupturing of RBCs) may affect sample results from our current chemistry analyzer. These guidelines are derived from manufacturer’s recommendations and is based on data from spiking human samples with hemoglobin. These values may not apply to samples from animals and there are important species differences (for example, a high potassium is expected in hemolyzed samples from horses, camelids, pigs and sh…

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Chemistry

Veterinarians use clinical chemistry and other laboratory tests to diagnose disease, to monitor disease progression or response to therapy, and to screen for the presence of underlying disease in apparently healthy animals. A wide variety of clinical chemistry tests are offered by clinical pathology laboratories for this purpose (laboratories differ on the combination of tests and test panels offered to their clients). The Clinical Pathology Lab…

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Lipid overview

…de concentrations (with minimal to no expected increase in cholesterol). Lipemia interferes with results of hematology and chemistry testing (see test basics, interferences, interference indexes) and should be avoided at all costs. Post-prandial lipemia can be minimized by collecting blood after a 12 hour fast in dogs and cats (see sample collection guidelines for hematology and chemistry), whereas blood sample collection in l…

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Protein C

…cofactor for activated protein C. Protein S is found in two forms, free and that bound to C4b-protein. Only the free form of protein S is active as a cofactor for protein C. Protein C has several functions: Anticoagulation: It is an anticoagulant protein that inhibits thrombin formation by binding to and inactivating (through cleavage) FVa and FVIIIa, the cofactors of the “intrinsic” tenase and prothrombinase complexes, respectively….

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Passive transfer failure

…they are rapid and easy to use, but are less sensitive to decreased FPTI than RID or immunoturbidometry. Other tests are available but reliability tends to be lower and varies by species. These include: Total protein by refractometry or the biuret method, Brix refractometry, globulin measurement, methods dependent on protein precipitation (ZnSO4 turbidity, Na2SO3 precipitation, glutaraldehyde coagulation test). IgG measurement for failure of pa…

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von Willebrand disease

…n platelet aggregation. Essentially, vWf acts like as an initial sticky tether, capturing circulating platelets and slowing their velocity in fast moving blood in vessels (such as arterioles), allowing for firmer adhesion to be mediated by slower acting integrins. The multimeric nature of vWf is important in this capturing effect (think of the unfurled protein as a string upon which platelets can transiently bind and roll), whereas compact vWf ca…

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Fibrinolysis

Fibrinolytic pathway tests measure of clot breakdown products, FDPs and D-dimer Tests for fibrinolysis involve evaluation of the fibrinolytic pathway. Unfortunately, measurement of many components of the fibrinolytic pathway, including plasminogen, tissue plasminogen activator, plasminogen activator inhibitor, have not been developed or validated in animals, or those that have, work poorly. Therefore, these tests are not offered routinely, whic…

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Albumin

…hanges in albumin concentration can selective (affecting albumin only) or non-selective (affecting both albumin and globulins). Selective versus non-selective changes in albumin and globulins yields potential clues as to the mechanism and cause for these abnormal results, as outlined below (the A:G ratio can be used as a guide as to selective versus non-selective changes). Increased albumin concentration (hyperalbuminemia) The most common cause o…

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